Pressure-controlling device.



yescasa erstellten, or sfr. Louis, dissocier.' i reassess-ocurrieron@ nevica,

spaarzaam of :teneri raient. 'Patented tree. i li 3 Application filed November 22, 192. Serial Bio.

To all whom may concern.'

Ee it known that l, Geenen ll., Simmern, a citizen of the United States, residing at 1t. Louis, l'iissouri, have invented a certain nei-tv' and useul lrnprovenient in Pressure- ControllimT Devices ot which the following a 9 l? is a tull7 clear, and exact description, such as i u enable others skilled in the art to which it app'ertains to make and use the Sali f5.

This invention relates to pressure conrolling devices or the' type `which comprise means for actuating a member that governs the supply orn an expansi'ble or pressure medium to a storage chamber or reservoir so' as to automatically cut down the supply when' the pressure in the storage ehainher reaches or exceeds a certain degree and also cause the su y to he resumed when the' pressure in inc storage chamber drops hel'ow a certain legree.

'The provid type rei2 a simple and rugged device ot' the erred to that comprises no delicate parts and is positive in action under coinmercial conditions as found when these devices are used or maintained by unskilled persons.

` another object of my inventionv is to provide a. pressure-controlling device' of the type referred to which is so constructed that a comparatively slight or immaterial drop in pressure after the controlled inen'iloer has heen renderedinoperative, Will notv affect the device or cause the movahle parts ot to act, thereby preventing .the device virorn operating too frequently aid thus vv ving out quickly,

Another object is to provide a pressurecontrollinff device that comprises a vvalve -r' which is so designed that a greater ot the valve is presented to the action ofthe expansihle medium that unsea'ts the valve alter the valve has been penseel, than is presented to the action of said eiipansiole rnediuin when the valve is seated, the valve moving to its open position ,n as the 'pressure of the expansililc #iiuin that acts on saine overcomes the 4 cans that holds the valve A ning open, due to the additional expose( area o'` saine? until the pressure of the expansihle medium drops materially or to such a degree that the pressure per square inch is slightly less than the reduced area or" the valve that is exprincipal object of my invention is to e i l l l posed when the valve is seated and less than the :torce oriy the valve-closing means. F or example, if the entire area of the valve is one square inch but only {'U of the valve is exposed to the' expansible medium when the valve is seated, and a spring Whose force is equal to 90 lbs. pressure per square inch is employed to hold the valve seated7 the valve will not 'open until the pressure of the expansihle medium exceeds 100 lbs. per square inch, due to the fact that the exposed area of the valve is only {l square inches but after the valve opens it will remain open until the pressure ot the expansible medium drops below 90 lhs. per square inch.- And still another object is to provide a pressurecontrolling device of the type referred to in which the movable part that actuatcs the member to he governed consists of a packinglcss piston which is so constructed that` the cxpansiole medium that moves saine cannot leali around the piston, thereby enabling the device to loe used successfully for controlling the pressure of a storagexcharnher that contains steam or various other mediums that have a deleterious ellect on leather and similar materials such vas are generally used lfor packing the pistons oi pressurcs-controlling devices.

@their objects and desirable features oi' niy invention will he hereinafter pointed out.

l have herein shown my improved pressure-controlling device used for governing the suction valves oif an air compressor that is connected with a storage chamber or reservoir, so as to hold said valves from their seats automatically and thus cause the coinpressor to become inoperative when the pressure in the storage chamber or reservoir reaches or exceeds a certain degree and alloiv said valves to resume nolnxal- `unction so to render the compressor operative when the pressure. in the storage chamber drops below a certain degree, but l do not Wish it to be understood that my invention is lin'iiied to this specific use for it can be used for automatically governing any hind ot a iucchanism that controls lthe supply of an expansihle or 'pressuremedium to a storage chamber or reservoir.

Figure 'l ofthe drawings is a vertical sectional view ol' a pressure-con Volling device constructed in accordance Awith my invention, and shows a portion ot an air compressor Whose suction valves are automatically llG governed by said device; and Fig: 2 is a. horizontal sectional View taken on the line QQ of'Fig. 1. A

Referring to the drawings which illustrate the preferred form of my invention, A Idesignates one of the suction valves of a compressorB which is connected `/vith fa storage chamber or reservoir, not shi vn, and C 4designates a lever that moves said valveso as to hold .it :from its seat, against the` force of the spring D Which normally allows the valve to be seated.

My improved' pressure controlling device consists of a'cyliiider l provided with aopis ton 2 that acts upon the valve-controllingde'; ver C, a pressure chamber 3 that is 'connect-A ed with the storage chamber or reservoir, not. shown,

by means of a supply pipe 4, and al' diaphragm 5 arranged over said pressure' chamber which acts as a valve for controh' ling the low of the expansible medium through the port or 'duct that. establishes communication between the pressure chamber 3 and the cylinder 1 in which the pistorif 2 operates. The diaphragm 5 acts vas diaphragm and valve, and a spring-pressed plunger-`7 is arranged above the same, as

shown 1n Fig.' 1, so as to hold the valveV seated., the supply pipe e which establishes communication between the pressure chamber and the storage reservoirientering the lower portion of the pressure' chamber so f that the expansible medium will exert uplj ti Ward pressure ont-he under side of the valve or diaphragm 5 and thus tend to raise it from its scat. In order that the plunger 2 will not operate incessantly or toov frequently when the pressure in the storage chamber or reservoir varies immaterially or s ightly, l have constructed the device in suoli a manner that a greater area of the diaphragm valve 5 is exposed to the act-ion of the expansible medium in the pressure chamber after said valve opens than is exposed to said cxpansihle medium when said valve is closed, thereby causing the valve 5 to remain open after it'lias been unseated until the pressure in the storage chamber has dropped materially or proportionallyto'thc rise 1n pressure which caused thevalve to open. In the preferred form of my invention as'hercin shown this is accomplished by using a flat, disk-shaped diaphragm valve 5 and forming u raised valve-seat 5a at the center of the pressure chamber 3 thatpractically covers the center portion of the valve 5 when it is seated and thus prevents the entire area of the valve from bein exposed to the action of the expansible medium that tends to unseat the valve. The valve-seat 5a preferably consists of an annular rib 0n the bottom of thc pressure chamber 3 that surrounds the pori (i, and the up er edge of said rib is made comparatively s larp so that thc vulve 5 will be sure to iit tightly against .ent valve areas, the lesser area being'exposed when the valve is unseated.

opens, the expansible medium Hows through t inder l and the dium in the upper .causing the compressor-to 'its seat. In this way'I obtain two di'erbeing ex posed tothe action of the e'xpansible medium when the valve is seated and the greater area It the entire area' of the under side of the. 7e diaphragm valve 5 is one square inch, the area of the ring-shapedlvalve seat 5 is 116 of' a square inch, and the s ring 7 that acts on the plunger 7 which ho ds the valve seated 75 has a force corresponding to lbs. pressure per square inch, the valve-5 willremain seated until the' pressure in the storage reservoir and supply pipe 4: exceeds 100 lbs. pres-1 Vsure per' square inch, this, of course, being due to the fact. that the area, of the under side o thevalve which is exposed "to" the' pressure in the supply pipe 4 is onlyr 1% of o square inch As soon as the pressure"e" ceedslbs. and the valve 5 opens5 thefvalvs M, area is increased 10% due, of course, 'tothe uncovering of the center portion ofthe tot@ and eonsequentlythe entire under sideo 't of. valve will be exposed to 'the pressure-'ini 0i" pressure chamber 3. As soon as thefvalvei .9@

the duct or port 6 and imparts-fmoverme to the piston 2, thereby causing the lsv si' C to open tne suction valvesvD and thus re der the compressor inoperative.` After the@4 Vvalve 5 has been openedfit remains open until the pressure inthe `storage reservoir.y and supply 4; drops below 90 lbapres sure per square inchgor', in other worden. until the force of the-spring 'P1-overcomes the force of the expansible, medium that'utf Seated the valve, the piston 2whicliact upon the controlled members@ remaini a rest until the valve closes the portf' trip establishes communication between thefoylf rassure supplyline e'. After the valve 5 c o ses; the expansibleine; portion of the cyiiadoigii escapes through a' ranch 'port gmaulohf a leak screw 8 is arranged, threbjyopermitf ting the pistonatoinove u wardly :Stadtbus come operative; A icy-pass 9,that,is cont-rolled by ealvfeuln leads from the pressure chambcr tothe cylf, inder '1 so as to enable pressure' to beap. plied to the istoii Zand. thus cause theorie.' tion valves of the compressor to 4oizee'i-i when it is desired .to do so inde endently of the automatic act-ion o the evice. The range ot pressure between the-pressuresf'at 120 which the'diaphragm valveopensand closes isproportiona'l'to the difference inrare'g'sof the diaphragm-"valveexposedto"pre'ssure when saidvalveis' awa from `it's.a 1'mulir A scat and when against said seat,` spftht folge' 125 considerablerenge in ressure piiovideean" annular valve seat opcomparativelylarge diameter, 'and tor7` a smaller rang'e in pres-- sure l rovide asmaller annular valveseatt lt is o vious that this desirable' objectfc'an 130 ice' iio'

but it, een drop materially below diiiiercnt dinnieters.

noveno' 'he secured by usingl nserted vulve seats .of

vover e pressure chamber have been used )for years, and ihiit osid separate valves give :i oierentiel pre re action when they ere Well mafie and in emot Working condition. l have found, however, that seid separate valves are delicate, and liable 'to get out of 'Working ord-er and ere not simple or dependable as ed and simple device shown vf ich omits the separee valve the i. directly es volver. @imple device also permits of employing and a less range in be commercially pracseperete valve. My imine d vice cost i. than `cider deproved vvices end is innen more positive and dependeble.

the foregoing* it will -controiling device oit the construcon uo ove-descrfced e'ii'ectively and posi- 'cively controis the pressure in :i storage chamber or reservoir in such @manner that the pressure cannot exceed :L certain degree the nor- 'the pressure-producing mal .pressure after has been rendered inoperative, before scid pfessureproducing means is again renopersitive; the chief advantage oit such device'heing that it does not operate incessantiy or toerequently and consequently Wili not Wear out quickly.,

in eddi'liion to the desirable feature abovementioned my device is adapted for use with practically any kind of :inexpunsible medium owing to the fact that the piston 'Z which actuates the controlled meinher is :i packinglesspiston and is sodesigned that the expsnsible medium which actuetes seme cnnnotlees around the piston, Eis shown in the cylinder l, in which 'the pistou 2 is arranged is provided with tufo portions' oi" diiieren'l; diameters,

and she piston 2 is liso provided ,viih tivo portions that are oi' The upper portion a L'- Q"- F .V1 .f1-

os, the piston 1e or giczitei mmnetei .non the louer portion b, and u beveled. surface a is formed at the junction ot the tuo 'porzions of ih@ pis-ion, A corresponflingflv-slmped beveled sert c is also 'formell :it the x lnction upper and lov portions of the cylir Conselplenelys when pressure adcd to the upper end off the cylinder l e nisnn Q will he forced :hiwnxverdly unho, beveled sont, f' thereon re is" upon the "'eled surfnet: r" on c i oi the c/li L smidA coopera ing beveled surfaces i'orx'ni'ng' a tight. joiiiihctu'oen the piston und the cylinder, sinn check valve seat, which prev/nis the ei;- pensible medium from leaking around. the

be seen that n,

nr to n commercial pi ton. The feet that the piston 2 is not packed With leather or any other material such as is generally used for packing the pistons'of pressure-controlling devices makes it possible to successfully use my improved device in connection with steam and other expansible; mediums that have u deleterious eilfecton piston packing materials.

in order to prevent scale und. other particles of 'foreign metter which pass through the supply pipe el from lodging between the valve 5 and the sent, prefer to arrange a layer of' filtering materiel' 12v in 'the pressure chamber 3 in such a manner that the expansible medium which enters said chamber will pass through seid material and thus he filtered.

Having" thus described my invention, what Il claim. as new and desire to secure by Let ters Patent is:

, l. in e pressure-controlling device?. the combination of a psclingless piston that is edapted to actuante e member which it is desired to control, a supply port leading to the cylinder in which said piston moves, a diaphragm valve for controllingsaid port and which is adapted to he unece-ted entomat-ically when. the pressure that is being regulated reaches and exceeds a certain degrec, thereby causing the pressureto enter said cylinder and act on the piston therein, und means whereby a greater uren of said valve is presented to the notion of the pressure medium after the vnlve has been unseat- -ed than is presented to the action of said pressure medium when the valve is seated, thereby causing the valve to remain open and thus cause the pressure to act ou snid piston until-the pressure has dropped to a; greater degree proportionally than therise in pressure which caused 'the valve to open.

2. A pressure-controlling device provided with a packingless piston that is reciprocat ingly mounted inside of :t cylinder, 'a controlled member which said piston acts upon, said piston having a beveled surface and .i coperating beveled surface on the interior of the cylinder so :is to form .e tight point between the piston 1nd the cylinderd yvhmji Jthe piston is :it `the end of its pressurcstirolw;

3. A pressurecontrolling device provided. with a packingless piston that acts on n. member which it is desired o control thc head of the pistonl on which the operating# beveled Seaton the interior of' the cylinder 4on 'which .the beveled surnice ot the piston acts when. it is at the end oi' its stroke in one direction. Y

et. A. pressure-controll1ngF device compris- .ing a valve cbsmbfarhn c5/limiter, a pack mgless piston in smid cjyinie adaped to operate on a memberfwlch causesthe pressure being controlled 'to build up, said pison having a beveed sniff-aca hat wists on a beveled surface inside of the nynder,

means fr admitting "che Agy'essugi'e con:

txollefl to said Valve clmmoe a port 'Sfmt establishes communcaion bawaen said chamba? and cylinder, a diphmgmvalve arranged over smid chamber i201" gave mg' A hrouvfh betom of'sad chamber surrounding Seidl pom and norma'lyoverng a porfion 0f sai miv@ Wch is pres'ened to the action of he pressmre medium Wham the valva is open? and a@ spfng for seating the valve;

signaure im the mesance o two Witnesses, 20

ths; 16th day of November 1912.

- STEEDNHL W'tnesses R. E, VVXNKLER, @EON S., BUCKLES. 

